Sewing machine feed mechanism



Aug. 27, 1935. R. K. HOHMANN SEWING MAbHINE FEED MECHANISM Filed Jan.25, 1931 2 Sheets-Sheet 1 A TTORNEY Aug 27, W35. R. K. HOHMANN SEWINGMACHINE FEED MECHANISM Filed Jan. 25, 1931 2 Sheets-Sheet 2 IN V EN TOR.i/cbw/m ff flaHMkN/V ATTORNEY 'IIIM'IIIIIIIIl' Patented Aug. 27, 1935Richard K. Hohmann, Brooklyn, N. Y., assignor,

by mesne assignments, to The Singer Manufacturing Company,Elizabethport, N. J., a corporation of New Jersey Application January23, 1931, Serial No. 510,645

Claims. (01. 112-215) My present invention consists of certain im- Iprovements in sewing machine feed mechanisms and particularly in feedmechanisms for lock" stitch rotary hook sewing machines.

The general object of my invention is the provision of an improvedsewing machine actuating mechanism and feed mechanism which ischaracterized by its freedom from vibration simplicity, compactness anddurability, by its provisions facilitating its accurate assembly andincorporation in the machine, and by its capacity for regulation inaccordance with the character of the material being sewn. A furtherobject of my invention is to provide a simplified and improvedcoordinated arrangement of a feed-dog actuating mechanism and a rotaryhook lockstitch-forming mechanism. A further and more specific object ofmy invention is the provision of mechanism for regulating the length ofthe stroke of the feed dog or point, ,and thereby the number ofstitches'made' per inch of material. Other specific objects are theprovision of an improved mounting of the feed dog on the feed bar,permitting any necessary or desirable adjustments'in the position of thework engaging surface of the feed dog to be efiected and other means forvarying the plane of movement of the work engaging surface during thefeed stroke of,

the dog.

The various features of novelty which characterize my inventionarepointed out with particularity in the claims annexed to and forming apart of this specification. For a better understanding of the invention,however, and the advantages possessed by it reference should be had tothe accompanying drawings and descriptive matter in which I haveillustrated and described preferred embodiments of the invention.

Of the drawings:

Fig. 1 is an elevation of a portable two thread rotary hook lock stitchmotor driven sewing machine incorporating my invention, certain parts ofthe frame casting of the machine being broken away to illustrate partsenclosed thereby;

Fig. 2 is a planview of the machine illustrated in Fig. "1, partly insection on the line 2-2 .of

on the line vention illustrated in the drawings, A designates a basemember upon which the frame casting of the machine is detachablysecured. The latter comprises a bed B, a standard B, and a bracketarm 25supported by the standard and terminating at its free end in a head Ball of which except for the bed B are of well known construction. Thebed B is in the form of a shallow inverted pan open at its undersidewith the edge.

of its rim portion seated on the base member A and preferably detachablysecured to the latter. The top surface of the bed serves as the clothplate or work support of the machine.

In the machine illustrated, the operating mechanism comprises a hookactuating shaft C carrying a rotary hook C at one end and journalledadjacent the latter in a partition B of the bed casting. The oppositeend of the hook shaft is operatively connected to an electric motor Marranged in the bed by means of pulleys M and C mounted on the motorshaft M and hook shaft 0, respectively, and connected by an elastic ofthe hook shaft. The rotation of the needle shaft D effects reciprqcatorymovements of a needle bar D and needle D and oscillating movements of atake-up lever D through suit able mechanism. A presser foot bar Dpresser foot D and other parts of conventional form are alsoillustrated.

Mounted within the hollow bed B is a short feed shaft E preferablyarranged parallel to the hook shaft C and journalled in the partition 3*and in a spaced lug portion Bf depending from the under surface of thebed. The feed shaft E is driven at half the angular speed of the shaft Cby means of meshing spur gears E and C carried by the shafts E and C,respectively. At one side of the partition 3*, the shaft -E carries alift eccentric E and a feed eccentric E the functions of which willappear hereinafter. The work surface of the bed is provided with asuitable opening, the marginal portions of which form a seat B for aneedle plate F removably mounted therein and level with the surroundingsurface of the bed. The needle plate is formed with the usual opening Ffor a feed dog P, which opening is elongated in the direction of thefeed to permit reciprocating movements relative thereto by the feed dogP.

The feed dog P is formed with a thin rearwardly extending and dependingbase portion P, which is adjustably mounted on a feed bar Q. The feedbar is formed with a slot or guideway Q in its rear end and arranged toreceive a fulcrum stud Q mounted in the partitionB. With thisconstruction the feed bar is capable of both oscillating and slidingmovements relative tothe fulcrum stud. As indicated in Fig. 3, the rearportion of the body of the feed bar is provided with a recess Q openingto the slotted end of the bar and in which a spring Q is arranged,whereby the feed bar is constantly urged toward the front of themachine.

The operating mechanism through which the feed dog is moved through itsdesired path comprises novel-provisions operatively connecting the feedbar Q to the eccentrics E and E mounted on the feed shaft. Theseprovisions include an intermediary member or thrust bar R which has oneend pivoted on a pin R carried bya depending bracket R of the feed baradjacent its rear end. The front end of the thrust bar engages theconcavely curved rear surface of a vibratory operating lever S which ispivotally mounted on a post or stud S secured to the partition 13 and isinterposed between the forward end of the thrust bar R and the eccentricE Any rotation of the feed shaft therefore efiects intermittentreciprocating movements of the feed bar and feed dog.

In the construction shown, the lift eccentric E acts on the underside ofthe feed bar adjacent its forward end to effect an intermittent raisingand lowering of the feed dog relative to the needle plate. To somewhatreduce the amount of machining and wear on the feed bar while providinga good bearing surface for the lift eccentric and for other purposes, Ihave provided a narrow strip Q of steel or analogous material at theunderside of the feed bar for the desired bearing surface. The bearingpart Q is preferably arranged in a curved cut-away portion of the feedbar and held therein in resilient contact therewith by a screw Qadjacent its rear end.

The length of the feed stroke of the feed dog can be adjusted by,varying the pointof contact of the front end of the interponent R with.

the operating lever S. This adjustment is effected by a stitchregulating lever R which is fulcrumed on a stud R mounted in thepartition B below and between the axes of the feed and hook shafts. Therear end of the stitch regulating lever is provided with a pin Rreceived in a slot R formed in the thrust bar R adjacent its front end.The forward end of the lever l t projects through a vertical slot Bformed in the front side of the bed, as shown in Figs. 1, 2, 3, and 6.The projection of the lever is suffiicent to enable it to be moved aboutits. fulcrum by the operator into various positions relative tothe'slot. With the arrangement shown, when the lever B is moved into thelower portion of the slot, the feed stroke will be lengthened, whilewhen the lever is moved towards the upper end of the slot, the length ofthe feed stroke will be decreased.

The lever R is advantageously bent laterally tially prevent accidentaldislodgment of the lever from its adjusted position by contact with theclothing of the operator. Scale marks R indicating the number ofstitches per inch for corresponding positions of the lever R in theslot, are marked on the bed alongside the slot, or preferably on anescutcheon plate R, which is arranged to register with the slot at itsforward end and thus is in the view of the operator.

To provide a more secure positioning of the lever R the resilientlycontacting portion of the lever may be formed with a rib R which isarranged to fit into any one of a series of ribreceiving notches Rformed in the slotted portion of the escutcheon or bed or in both, asshown in Fig. 6. This arrangement effectively prevents dislodgment ofthe lever under small forces,

chiefly accidental, but the number of positions to which adjustments maybe made is necessarily less than when the previously describedarrangement is used.

The mechanism described for regulating the length of the feed stroke,and thereby the number of stitches made per inch of material, provides asufficient number of feed adjustments for ordinary uses, permitting adesirable regulation of the stitching operation on fabrics of differentweights or thicknesses as well as satisfying the ideas of differentoperators as to the proper number of stitches to be made per inch. Ingeneral, it is desirable to use a greater number of stitches per inch onrelatively thin fabrics than with materials of greater weight orthickness.

In the assembly of the machine, the feed dog P is mounted along theouter fore portion of the feed bar .Q and is connected thereto by afulcrum screw P, which extends through a suitable opening at the forwardend of the feed dog base P into a corresponding threaded hole in thefeed bar. A limited levelling adjustment of the feed dog about itsfulcrum is possible by a special connection between the rear end of thefeed dog base and the bar. These connecting provisions consist of aslightly enlarged opening P in the base P and through which a stud boltP extends to engage a threaded recess in the feed bar. The enlargementof the opening P permits a slight angular movement of the feed dog aboutits fulcrum, which is normally sufficient to pennit anydesiredadjustment of the feed dog for varying conditions of operation orto compensate for inaccuracies in the manufacture of the parts. In theordinary use of the machine, the toothed surface of the feed dog extendsabove the upper surface of the needle plate only when the feed dog ismaking its feed stroke. Usually the levelling adjustment described ismade by a mechanic during the assembly operations. Because of the usualpermanent nature of this adjustment, the stud P is preferably made withan hexagonal head, as shown in Fig. 3, to permit a more secureconnection.

The eifect of the above mentioned levelling adjustments of the feed dogis to vary the inclination of the toothed surface. or work engaging faceof the dog relative to the needle plate. For ordinary operation a zeroinclination or parallelism of said face and needle plate is mostdesirable. However, for relatively thin and delicate fabrics thissurface may be arranged with a slight inclination toward its rear orheel. Such an arrangement provides a slightly tighter grip between theheel of the feed dog and the heel of the presser foot than with theseparts in parallel and prevents the gathering or puckering of thematerial which would occur if the forward end of the feed point weretilted.

Provisions are also made for adjusting the actual height or elevationrelative to the needle plate of the work engaging face of the feed dogduring the feeding strokes of the feed dog. Such provisions are usefulduring the assembly of the machine and after it has been put .inoperation. Inasmuch as the elevation of the feed dog during its feedstroke depends upon the relative proportioning of the feed device andlift eccentric, I provide simple and efiective means for varying theeffect of the eccentric movement. In this embodiment, this result isaccomplished by varying the position of the spring strip Q relative tothe adjacent surface of the feed dog by means of a stud bolt Q arrangedin a threaded passage in the feed bar at or adjacent the point ofcontact of the bearing strip with the eccentric. When the strip ispressed closely against the under surface of the feed bar, the elevationof the feed dog will be at its lowest. When, however, the stud isrotated to move the bearing strip away from the under surface of thefeed bar, the elevation will be increased by an extent correspondingsubstantially to the change in position of the bearing strip relative tothe feed dog. This adjustment of the elevation of the feed dog movementmay be quite necemary or desirable in the assembly of the machine or topermit a higher grade of work on more delicate fabrics. Such adjustmentof elevation of the working engaging face of the feed dog is necessaryalso to compensate for the effect on the elevation of said face of thepreviously described levelling adjustments since the spacing of the axisof the fulcrum screw P to one side of the work engaging face of the feeddog results in a variation in the elevation of said face whenever alevelling adjustment is made.

The feed bar Q is also provided with a tongue Q at the inner side of itsforward edge, one side of which is in the same vertical plane asthecorresponding side of the slotted feed bar section Q. These surfacesare arranged in sliding contact with the outer side of the. partition3*, providing additional guiding of the feed bar durin its movements.

Reference may be had to Patent No. 1,916,860, dated July 4, 1933, on myprior application Serial No. 242,368, filed Dec. 24, 1927, whichdiscloses but does not claim certain novel features of constructiondisclosed and claimed herein and of which this application is adivision.

By providing a sewing machine with three interconnected parallel rotaryshafts terminating adjacent the closely juxtaposed parallel planes ofaction of the stitch-forming and feeding instrumentalities driven bysaid shafts, I am enabled' to secure many important advantagesciprocating and oscillating parts are materially reduced. I

The feed-lift eccentric may be located atjthe end of the feed-shaftwhich is preferably disposed closely in rear of the hook-shaft and, be-

ing close to the line of feed, the feed-lift action of said eccentricupon the feed-bar may be applied desirably close to the front end of thefeedbar and to the vertical plane thereof without encroachment upon thefield of action of the rotary hook. These considerations'minimizetilting or torsional strains in the feed-bar, reduce the reactionarystrains on the pivotal bearing at the end of the feed-bar and enable thefeed-bar to be made correspondingly light in weight without sacrifice ofthe necessary strength.

The rotary hook, which is preferably closely nested in front of thefeed-lift eccentric, and below the forwardly overhanging feed-dog carried preferably at the front end of the feed-bar, is entirely exposedboth in front of and below its peripheral rim portion and in front ofits face. It is thus well exposed for inspection, cleaning, timing,removal and replacement of the bobbin. The feed-bar may be madedesirably long and located preferably entirely in rear of the rotaryhock without positioning the latter abnormally close to the front edgeof the conventional sewing machine cloth-plate.

A rotary hook of conventional size may be mounted directly upon the endof the faster of the two shafts in closely nested relation with, butwithout encroachment upon the feeding mechanism and the combined feedingand rotary hook mechanism may be housed 1n a sewing machine ofcommercially normal depth.

While in accordance with the provisions of the statutes, I haveillustrated and described the best form of embodiment of my inventionnow known to me, it will be apparent to those skilled in the art thatchanges may be made in the form of the apparatus disclosed withoutdeparting from the spirit of my inventionas set forth in the appendedclaims and that in some cases certain features of my invention may beused to advantage without a corresponding use of other features.

Having now described my invention what I claim as new and desire tosecure by Letters Patent, is: l

1. In a sewing machine, the combination with a bed, of a feed shaftjournalled in said bed, a feed dog, a feed bar arranged forreciprocating movements relative to said bed and carrying said feed dog,an arcuate lever adjacent said feed bar, a link carried by said feed barand having its free end abutting one side of said lever, an eccentric onsaid feed shaft and arranged to operatively engage the opposite side ofsaid lever to oscillate the same about its fulcrum, and means forvarying the point of abutment of said link with said lever.

2. In a sewing machine, the combination with a bed, of a feed shaftjournalled in said bed, a feed dog, a feed bar arranged forreciprocating movements relative to said bed and carrying said feed dog,an arcuate lever adjacent said feed bar, a link carried at one end bysaid feed bar and having its opposite end abutting one side-of saidlever, an eccentric on said feed shaft and arranged to operativelyengage the opposite side of said lever to oscillate the same about itsfulcrum, and a lever engaging said link and arranged to vary. the pointof abutment of said link with said arcuate lever.

3. In a sewing machine, the combination with a bed and needle plate, ofa feed dog having a work engaging face and means for giving feedingmovements to said dog, said means comprising a feed bar mounted in saidbed for reciprocating and oscillating movements,-'a connection betweensaid dog and bar including means for adjusting the position of the dogrelative to the bar angularly about an axis which is transverse to theplane of said feeding movements and which is displaced horizontally fromsaid work engaging face to thereby vary the inclination of said face tosaid plate during said feeding movements, and separate adjusting meansfor varying the elevation of said face relative to said plate duringsaid feeding movements.

4. In a sewing machine, the combination with a bed and needle plate, ofa feed dog having a work engaging face and means for giving feedingmovements to said dog, said means comprising a feed bar mounted in saidbed for reciprocating and oscillating movements, a connection betweensaid dog and bar including means for adjusting the position of the dogrelative to the bar angularly about an axis which is transverse to theplane of said feeding movements and which is displaced horizontally fromsaid work engaging face to thereby vary the inclination of said face tosaid plate during said feeding movements, and

means for adjusting the position of said feed barrelative to said bed tothereby vary the elevation of said face relative to said plate duringsaid feeding movements.

5. In a sewing machine, the combination with a bed and needle plate, ofa feed dog having a work engaging face, and means for giving feedingmovements to said dog, said means comprising a feed bar mounted in saidbed for reciprocating and oscillating movements, a pivotal connectionbetween said dog and bar, the axis of said connection being parallel tosaid plate and transverse to the direction or" said feeding movementsand spaced away from said face, whereby adjustment of said dog relativeto said bar about said axis varies both the inclination and elevation ofsaid face relative to said plate during said feeding movements, lockingmeans for securing said dog to said bar in different adjustmentpositions of said dog about said axis relative to said bar and means foradjusting the position of said feed bar relative to said bed to therebyvary the, elevation of said face relative to said plate during saidfeeding movements.

6. A lock-stitch sewing machine having a frame including a bed, acloth-plate, a standard rising from said bed and a bracket-arm carriedby said standard and overhanging said bed, an upper rotary shaftjournaled in said bracket-arm, twolower rotary shafts journaled belowsaid clothplate in parallelism with each other and with the cloth-plate,means interconnecting said three shafts to cause them to rotate in timedrelation and each with a uniform angular. velocity, a reciprocatoryneedle connected to be actuated by said upper rotary shaft, a rotaryhook cooperating with said needle below said cloth-plate and actuated byone of said lower rotary shafts, a feedbar, a feed-dog carried therebyand mechanism actuated by the other of said lower rotary shafts forimparting four-motion movements to said feed-dog, said mechanismcomprising a feedlift eccentric fixed to the free end of said shaft forimparting a rising and falling movement to one end of said feed-bar, asecond eccentric fixed to said shaft, oscillatory mechanism actuated bysaid second eccentric and acting upon the other end of the feed-bar forimparting a feeding movement to said feed-bar, and means accessible atthe front of the machine for adjusting said oscillatory mechanism forvarying the forward feeding movement of said feed-dog.

-7. A sewing machine having a frame including a bed, a cloth-plate, astandard rising from said bed and a bracket-arm carried by said standardand overhanging said bed, an upper rotary shaft journaled in saidbracket-arm, a rotary shaft located below said bed, a rotary lock-stitchlooptaker carried by said shaft, a rotary feed-shaft located below saidbed and arranged in parallelism with the other two shafts, meansinterconnecting said three shafts to cause them to rotate in timedrelation and each with a uniform angular velocity, a reciprocatoryneedle connected to be actuated by said upper rotary shaft, a feed-barlocated entirely at one side of said loop-taker and in a planesubstantially 'at right angles to its axis of rotation, a feed-dogcarried thereby, a feed-lift eccentric fixed to one end of said rotaryfeedshaft'for imparting a rising and falling movement to one end of saidfeed-bar, a second eccentric fixed to said feed-shaft, and meansinterposed between said second eccentric and the other endof thefeed-bar for imparting a forward feeding movement to said feed-dog.

8. A sewing machine having a frame including a bed, a. cloth-plate, astandard rising from said bed and a bracket-arm carried by said standardand overhanging said bed, an upper rotary shaft journaled in saidbracket-arm, a rotary shaft located below said bed, a rotary lock-stitchlooptaker carried by said shaft, a rotary feed-shaft located below saidbed and arranged in parallelism with the other two shafts, meansinterconnecting said three shafts to cause them to rotate in timedrelation and with a uniform angular velocity, a reciprocatory needleconnected to be actuated by said upper rotary shaft, a feed-bar locatedentirely at one side of said loop-taker and in a plane substantially atright angles to its axis of rotation, a feed-dog carried thereby, afeed-lift eccentric fixed to one end of said rotary feed-shaft forimparting a rising and falling movement to one end of said feed-bar,'asecond eccentric fixed to said feed-shaft, means operatively connectingsaid second eccentric with the other end of the feedbar for imparting aforward feeding movement to said feed-dog, and means operable from thevside of the loop-taker opposite to the feed-bar for varying the forwardfeeding movement of said feed-dog.

9. A sewing machine having a frame including a cloth-plate and abracket-arm overhanging said cloth-plate, a rotary needle-reciprocatingshaft,

journaled in said bracket-arm, a rotary looptaker actuating shaft and arotary feed-actuating shaft journaled beneath said cloth-plate andarranged in parallelism with the needle-reciprocating shaft, drivingconnections between said shafts whereby the feed-shaft and theneedle-reciprocating shaft are caused to rotate at the same angularvelocity and the loop-taker actuating shaft at twice the angularvelocity of the other two shafts, a feed-bar, a feed-lift elementcarried by said feed-shaft, a feed-advance actuating element fixed tosaid feed-shaft, and operative connections between said feed-advanceelement and said feed-bar to impart work-advancing movement to thefeed-dog, including means manually operable during the operation of themachine for varying the amplitude of feed.

10. A sewing machine having a frame including a cloth-plate and abracket-arm overhanging said cloth-plate, a rotary needle-reciprocatingshaft journaled in said bracket-arm, a rotary looptaker actuating shaftand a rotary feed-actuating shaft journaled beneath said cloth -plateand arranged in parallelism with the needle-reciprocating shaft, drivingconnections between said shafts whereby the feed-actuating shaft and theneedlereciprocating shaft arecaused to rotate at the same angularvelocity and. the loop-taker actuating shaft at twice the angularvelocity of the feed-bar for imparting work-advancing movements to saidfeed-dog, and manually operable means for varying the effective actionof said vibratory member to impart work-advancing movement to saidfeed-dog.

11. A sewing machine having a frame including I cloth-plate, a rotaryneedle-reciprocating shaft.

j ournaled in said bracket-arm, a rotary loop-taker actuating shaft anda rotary feed-actuating shaft journaled beneath said cloth-platearranged in parallelism with the needle-reciprocating shaft, drivingconnections between said shafts whereby the feed-shaft and theneedle-reciprocating shaft are caused to rotate at the same angularvelocity and the loop-taker actuating shaft at twice the angularvelocity of the other two shafts, a feeddog, a feed-bar, a feed-liftelement carried by said feed-shaft, afeed-advance element fixed to saidfeed-shaft, a constant throw member operatively engaged by saidfeed-advance element and deriving therefrom constant operative movement,and means for transmitting work-advancing movement to the feed-bar fromsaid constant throws member including a pivotally supported intermediarymember and manually operable means for shifting I said intermediarymember about its pivotal axis to thereby vary the effective action ofsaid constant throw member thereupon. I

12. A sewing machine having a frame including a cloth-plate and abracket-arm overhanging said cloth-plate, a rotary needle-reciprocatingshaft journaled in said bracket-arm, a rotary loop-taker actuating shaftand a rotary feed-actuating shaft journaled beneath said cloth-plate andarranged in parallelism with the needle-reciprocating shaft, drivingconnections between said shafts whereby the feed-shaft and theneedle-reciprocating shaft are caused to rotate at the same angularvelocity and the loop-taker actuating shaft at twice the angularvelocity of the other two shafts, a feed-dog, a feed-bar carrying saidfeed-dog mounted for rocking and bodily endwise movements, a feed-liftelement carried by said feed-shaft for rocking said feedbar to therebytransmit rising andfalling move- 13. A sewing machine having a frame,including a cloth-plate and a bracket-arm overhanging said cloth-plate,a rotary needle-reciprocating shaft journaled in said bracket-arm, a.rotary loop-taker actuating shaft and a rotary feed-actuating shaftjournaled beneath said cloth-plate and arranged in parallelism with theneedle-reciprocating shaft, driving connections between said shaftswhereby the feed-shaft and the neesame angular velocity and theloop-taker actuating shaft at twice the angular velocity of the othertwo shafts, a feed-dog, a feed-bar carrying said feed-dog mounted forrocking and bodily endwise movements and. located entirely at one sideof said loop-taker actuating shaft and in a plane substantially at rightangles to its axis of rotation, a feed-lift element carried by saidfeed-shaft and arranged to impart rising and falling movements to saidfeed-dog, a feed-ad- Vance element carried by said feed-shaft, a memberderiving constant movements from said feedadvance element, aninterponent operatively engaged by said member to impart endwisemovements to said feed-bar, said interponent being mounted for shiftingmovement relative to 'said feed-bar abouta pivotal axis partaking of thebodily endwisamovements of the feed-bar, and manual means for shiftingsaid interponent about its pivotal axis to thereby vary the amplitude ofif:hedwgrk-advancing movements imparted to said ee ar.

14. A sewing machine having, in combination,

a bed, an overhanging bracket-arm, a rotary hook shaft journaled in saidbed, a rotary hook fixed to one end of said shaft, a rotary feedshaftjournaled in said bed at one side of the dlereciprocating shaft arecaused to rotate in the Y hook-shaft and having one of its endsterminating adjacent said hook, a rotary needle-bar shaft journaled insaid bracket-arm, means connecting said shafts whereby the feed-shaftand needle-bar shaft are caused to rotate at the same speed and the hookshaft at twice the speed of the other two shafts, a feed-bar, a feed-dogcarried thereby and overhanging saidhook, and

eccentrics carried by said feed-shaft and opera tively associated withsaid feed-bar for imparting rising-and-falling and feed-and-returnmovements to said feed-dog.

15. In a sewing machine, in combination, a frame having apower-receiving end and a sewing end and comprising a bed, a standardrising from said bed at the power receiving end of said frame, abracket-arm carried by said standard and overhanging said bed andterminating at its free end in a head at the sewing end ofsaid frame,stitch-forming instrumentalities including a reciprocatory needle and ahorizontal axis rotary hook, a needle-bar carrying said needle andmounted in said bracket-arm head, a feeddog, a four-motion feed-barcarrying said feeddog, said needle, rotary hook and feed-bar beingarranged to work in parallel vertical planes which are inclosejuxtapositionat the sewing end of the machine frame and aretransverse to the direction of length of said bed and bracket-arm,

andthree parallel rotary shafts for driving said I stitch-forming andfeeding instrumentalities, said shafts being normal to and terminatingadjacent the juxtaposed parallel planes of action .of the stitch-formingand feeding instrumentalitles .at the sewing end of the machine frame,one of said shafts being an upper shaft which is journaled in saidbracket-arm and connected at the free end of the latter to reciprocatesaid needlebar, the remaining two shafts being lower shafts andjournaled in said bed, said rotary hook being mounted on one of saidlower shafts, feed-lift and feed-advance eccentrics mounted on the otherof said lower shafts and connections adjacent the sewing end of themachine frame for imparting to said feed-bar its operative movements,and means interconnecting said three shafts in timed relation to causethe needle-bar shaft and feedshaft to run at the same speed and the hookshaft to make a plurality of rotations to one rotation of the needle-barand feed-shafts, one of said shafts having power-receiving means thereonat the power-receiving end of the machine frame.

16. A sewing machine having, in combination, a bed, an overhangingbracket-arm, a rotary needle-bar shaft journaled in said bracket-arm, arotary hook-shaft journaled in said bed, a feedshaft journaled in saidbed and located in rear of and in substantially the same horizontalplane as the rotary hook-shaft, means interconnecting said three shaftsfor causing said needle-bar shaft and said feed-shaft to rotate at thesame speed and the hook-shaft to make aplurality of complete rotationsfor each rotation of the other two shafts, a rotary hook secured to saidhook shaft, 2. pair of eccentrics on said feed-shaft, a feed-bar, afeed-dog carried thereby, and mechanism actuated by said eccentrics forimparting a feed and-return and rising-and-falling movement to saidfeed-bar.

17. A sewing machine having, in combination, a bed and an overhangingbracket-arm, a needlebar shaft journaled in said bracket-arm, a hookshaft and a feed-shaft journaled in said bed, said needle-bar shaft andsaid hook-shaft being arranged in substantially the same vertical planeand the feed-shaft being disposed in rear of and in substantially thesame horizontal plane as the hook shaft, means interconnecting saidshafts for causing them to rotate in timed relation, the needle-barshaft and feed-shaft rotating at the same speed and the hook shaftmaking a plurality of complete rotations for each rotation of the othershafts, a rotary hook carried by said hook shaft,

, a feed-lif t eccentric carried by said feed-shaft and shaft journaledin said bed, a rotary lock-stitch hook fixed to one end of said shaft, arotary feedshaft Journaled in said bed and having one of its endsterminating adjacent said hook, a rotary needle-bar shaft journaled insaid bracket-arm, gearing connecting said shafts whereby the feedshaftand needle-bar shaft are caused to rotate at the same speed and the hookshaft at twice the speed of the other two shafts, a feed-bar locatedmainly in rear of said hook-shaft, a feed-dog carried thereby an'doverhanging said hook, and a. pair of feed eccentrics carried by saidfeed-shaft, one of said eccentrics imparting a rising-andfallingmovement to said feed-bar and the other of said eccentrics imparting abackward and forward'movement to said feed-bar.

19. A sewing machine having, in combination, a bed and overhangingbracket-arm, a feed-shaft journaled in said bed, a hook shaft journaledin said bed in advance of said feed-shaft, said shafts being paralleland located in substantially the same horizontal plane, means foractuating one of said shafts, gearing connecting said shafts whereby thehook-shaft performs a plurality of complete rotations for each completerotation of the feedshaft, a rotary hook carried by said hook shaft andoperating in a vertical plane, the radius of the hook being less thanthe distance between said shafts, a feed-bar disposed mainly in rear ofsaid hook, a feed-dog carried thereby and overhanging said hook, and apair of feed eccentrics fixed to said feed-shaft for actuating saidfeed-bar.

20. A sewing machine having in combination, a bed andoverhanging'bracket-arm, a feed-shaft journaled in said bed, a hookshaft journaled in said bed in advance of said feed-shaft, said shaftsbeing parallel and located in substantially the same horizontal plane,means for actuating one of said shafts, gearing connecting said shaftswhereby the hook shaft performs a plurality of complete rotations foreach complete rotation of the feed-shaft, a rotary hook carried by saidhook shaft and operating in a vertical plane, the radius of the bookbeing less than the distance between said shafts, a feed-bar disposed inrear of said hook and having one of its ends mounted for pivotalmovement at a point remote from said hook and its other end locatedadjacent said hook, a feed-dog carried by said feed-bar and overhangingsaid hook, a feed-lift eccentric carried by said feed-shaft and locatedadjacent said hook, a second eccentric fixed to said feed-shaft, andmechanism interposed between said eccentric and the feed-bar forimparting a feed-advance movement thereto. v

RICHARD K. HOHIMANN.

